L7 sound problem BIG TIME HELP NEEDED!!

Ok so i got the L7 unlocked/unbranded and the ringtones and songs play fine that are on the phone already, but then i used motorola phone tools an made some ringtones and also loaded itunes on the phone an put songs on that too. Well It will play fine using headphones on both but on the regular phone speaker the sound cuts out an also goes real low. I told cingular about this and they told me something needed to be changed in my settings because it is not a cingular branded phone it is unlocked, but they didnt know how to do it. So anyone know how to help me???